I just picked up an 08 Toro Z4200 with low hours. Looks brand new. Does it make a difference if you run 87 or 93 octane?

What engine do you have? Look in the book and see what the manufacture calls for if you have one. Everyone one is different. I run mid grade in the 4 cycle engines. I also run mid grade in the 2 strokes, I do believe they call for 89 and above.

As I said I use midegrade basically in everything! I fill a 10 gallon and use it in quite a few different engines. I would hate to have a can for each machine, so they all just get middle grade (89) gasoline.